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sys/netinet6/ip6_output.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipfw.h" 69 #include "opt_ipsec.h" 70 #include "opt_sctp.h" 71 #include "opt_route.h" 72 73 #include <sys/param.h> 74 #include <sys/kernel.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/errno.h> 78 #include <sys/priv.h> 79 #include <sys/proc.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/syslog.h> 84 #include <sys/ucred.h> 85 86 #include <machine/in_cksum.h> 87 88 #include <net/if.h> 89 #include <net/netisr.h> 90 #include <net/route.h> 91 #include <net/pfil.h> 92 #include <net/vnet.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #include <netinet/ip_var.h> 97 #include <netinet6/in6_var.h> 98 #include <netinet/ip6.h> 99 #include <netinet/icmp6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet/in_pcb.h> 102 #include <netinet/tcp_var.h> 103 #include <netinet6/nd6.h> 104 105 #ifdef IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec6.h> 108 #include <netipsec/key.h> 109 #include <netinet6/ip6_ipsec.h> 110 #endif /* IPSEC */ 111 #ifdef SCTP 112 #include <netinet/sctp.h> 113 #include <netinet/sctp_crc32.h> 114 #endif 115 116 #include <netinet6/ip6protosw.h> 117 #include <netinet6/scope6_var.h> 118 119 #ifdef FLOWTABLE 120 #include <net/flowtable.h> 121 #endif 122 123 extern int in6_mcast_loop; 124 125 struct ip6_exthdrs { 126 struct mbuf *ip6e_ip6; 127 struct mbuf *ip6e_hbh; 128 struct mbuf *ip6e_dest1; 129 struct mbuf *ip6e_rthdr; 130 struct mbuf *ip6e_dest2; 131 }; 132 133 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *); 137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int); 140 141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int); 148 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 149 150 151 /* 152 * Make an extension header from option data. hp is the source, and 153 * mp is the destination. 154 */ 155 #define MAKE_EXTHDR(hp, mp) \ 156 do { \ 157 if (hp) { \ 158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 160 ((eh)->ip6e_len + 1) << 3); \ 161 if (error) \ 162 goto freehdrs; \ 163 } \ 164 } while (/*CONSTCOND*/ 0) 165 166 /* 167 * Form a chain of extension headers. 168 * m is the extension header mbuf 169 * mp is the previous mbuf in the chain 170 * p is the next header 171 * i is the type of option. 172 */ 173 #define MAKE_CHAIN(m, mp, p, i)\ 174 do {\ 175 if (m) {\ 176 if (!hdrsplit) \ 177 panic("assumption failed: hdr not split"); \ 178 *mtod((m), u_char *) = *(p);\ 179 *(p) = (i);\ 180 p = mtod((m), u_char *);\ 181 (m)->m_next = (mp)->m_next;\ 182 (mp)->m_next = (m);\ 183 (mp) = (m);\ 184 }\ 185 } while (/*CONSTCOND*/ 0) 186 187 void 188 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 189 { 190 u_short csum; 191 192 csum = in_cksum_skip(m, offset + plen, offset); 193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 194 csum = 0xffff; 195 offset += m->m_pkthdr.csum_data; /* checksum offset */ 196 197 if (offset + sizeof(u_short) > m->m_len) { 198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u " 199 "csum_flags=%b\n", __func__, m->m_len, plen, offset, 200 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 201 /* 202 * XXX this should not happen, but if it does, the correct 203 * behavior may be to insert the checksum in the appropriate 204 * next mbuf in the chain. 205 */ 206 return; 207 } 208 *(u_short *)(m->m_data + offset) = csum; 209 } 210 211 int 212 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 213 int mtu, uint32_t id) 214 { 215 struct mbuf *m, **mnext, *m_frgpart; 216 struct ip6_hdr *ip6, *mhip6; 217 struct ip6_frag *ip6f; 218 int off; 219 int error; 220 int tlen = m0->m_pkthdr.len; 221 222 KASSERT(( mtu % 8 == 0), ("Fragment length must be a multiple of 8")); 223 224 m = m0; 225 ip6 = mtod(m, struct ip6_hdr *); 226 mnext = &m->m_nextpkt; 227 228 for (off = hlen; off < tlen; off += mtu) { 229 m = m_gethdr(M_NOWAIT, MT_DATA); 230 if (!m) { 231 IP6STAT_INC(ip6s_odropped); 232 return (ENOBUFS); 233 } 234 m->m_flags = m0->m_flags & M_COPYFLAGS; 235 *mnext = m; 236 mnext = &m->m_nextpkt; 237 m->m_data += max_linkhdr; 238 mhip6 = mtod(m, struct ip6_hdr *); 239 *mhip6 = *ip6; 240 m->m_len = sizeof(*mhip6); 241 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 242 if (error) { 243 IP6STAT_INC(ip6s_odropped); 244 return (error); 245 } 246 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 247 if (off + mtu >= tlen) 248 mtu = tlen - off; 249 else 250 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 251 mhip6->ip6_plen = htons((u_short)(mtu + hlen + 252 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 253 if ((m_frgpart = m_copy(m0, off, mtu)) == 0) { 254 IP6STAT_INC(ip6s_odropped); 255 return (ENOBUFS); 256 } 257 m_cat(m, m_frgpart); 258 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f); 259 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 260 m->m_pkthdr.rcvif = NULL; 261 ip6f->ip6f_reserved = 0; 262 ip6f->ip6f_ident = id; 263 ip6f->ip6f_nxt = nextproto; 264 IP6STAT_INC(ip6s_ofragments); 265 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 266 } 267 268 return (0); 269 } 270 271 /* 272 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 273 * header (with pri, len, nxt, hlim, src, dst). 274 * This function may modify ver and hlim only. 275 * The mbuf chain containing the packet will be freed. 276 * The mbuf opt, if present, will not be freed. 277 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 278 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 279 * then result of route lookup is stored in ro->ro_rt. 280 * 281 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 282 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 283 * which is rt_mtu. 284 * 285 * ifpp - XXX: just for statistics 286 */ 287 int 288 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 289 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 290 struct ifnet **ifpp, struct inpcb *inp) 291 { 292 struct ip6_hdr *ip6; 293 struct ifnet *ifp, *origifp; 294 struct mbuf *m = m0; 295 struct mbuf *mprev = NULL; 296 int hlen, tlen, len; 297 struct route_in6 ip6route; 298 struct rtentry *rt = NULL; 299 struct sockaddr_in6 *dst, src_sa, dst_sa; 300 struct in6_addr odst; 301 int error = 0; 302 struct in6_ifaddr *ia = NULL; 303 u_long mtu; 304 int alwaysfrag, dontfrag; 305 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 306 struct ip6_exthdrs exthdrs; 307 struct in6_addr finaldst, src0, dst0; 308 u_int32_t zone; 309 struct route_in6 *ro_pmtu = NULL; 310 int hdrsplit = 0; 311 int sw_csum, tso; 312 struct m_tag *fwd_tag = NULL; 313 uint32_t id; 314 315 ip6 = mtod(m, struct ip6_hdr *); 316 if (ip6 == NULL) { 317 printf ("ip6 is NULL"); 318 goto bad; 319 } 320 321 if (inp != NULL) 322 M_SETFIB(m, inp->inp_inc.inc_fibnum); 323 324 finaldst = ip6->ip6_dst; 325 bzero(&exthdrs, sizeof(exthdrs)); 326 if (opt) { 327 /* Hop-by-Hop options header */ 328 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 329 /* Destination options header(1st part) */ 330 if (opt->ip6po_rthdr) { 331 /* 332 * Destination options header(1st part) 333 * This only makes sense with a routing header. 334 * See Section 9.2 of RFC 3542. 335 * Disabling this part just for MIP6 convenience is 336 * a bad idea. We need to think carefully about a 337 * way to make the advanced API coexist with MIP6 338 * options, which might automatically be inserted in 339 * the kernel. 340 */ 341 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 342 } 343 /* Routing header */ 344 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 345 /* Destination options header(2nd part) */ 346 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 347 } 348 349 #ifdef IPSEC 350 /* 351 * IPSec checking which handles several cases. 352 * FAST IPSEC: We re-injected the packet. 353 */ 354 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp)) 355 { 356 case 1: /* Bad packet */ 357 goto freehdrs; 358 case -1: /* IPSec done */ 359 goto done; 360 case 0: /* No IPSec */ 361 default: 362 break; 363 } 364 #endif /* IPSEC */ 365 366 /* 367 * Calculate the total length of the extension header chain. 368 * Keep the length of the unfragmentable part for fragmentation. 369 */ 370 optlen = 0; 371 if (exthdrs.ip6e_hbh) 372 optlen += exthdrs.ip6e_hbh->m_len; 373 if (exthdrs.ip6e_dest1) 374 optlen += exthdrs.ip6e_dest1->m_len; 375 if (exthdrs.ip6e_rthdr) 376 optlen += exthdrs.ip6e_rthdr->m_len; 377 unfragpartlen = optlen + sizeof(struct ip6_hdr); 378 379 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 380 if (exthdrs.ip6e_dest2) 381 optlen += exthdrs.ip6e_dest2->m_len; 382 383 /* 384 * If there is at least one extension header, 385 * separate IP6 header from the payload. 386 */ 387 if (optlen && !hdrsplit) { 388 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 389 m = NULL; 390 goto freehdrs; 391 } 392 m = exthdrs.ip6e_ip6; 393 hdrsplit++; 394 } 395 396 /* adjust pointer */ 397 ip6 = mtod(m, struct ip6_hdr *); 398 399 /* adjust mbuf packet header length */ 400 m->m_pkthdr.len += optlen; 401 plen = m->m_pkthdr.len - sizeof(*ip6); 402 403 /* If this is a jumbo payload, insert a jumbo payload option. */ 404 if (plen > IPV6_MAXPACKET) { 405 if (!hdrsplit) { 406 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 407 m = NULL; 408 goto freehdrs; 409 } 410 m = exthdrs.ip6e_ip6; 411 hdrsplit++; 412 } 413 /* adjust pointer */ 414 ip6 = mtod(m, struct ip6_hdr *); 415 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 416 goto freehdrs; 417 ip6->ip6_plen = 0; 418 } else 419 ip6->ip6_plen = htons(plen); 420 421 /* 422 * Concatenate headers and fill in next header fields. 423 * Here we have, on "m" 424 * IPv6 payload 425 * and we insert headers accordingly. Finally, we should be getting: 426 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 427 * 428 * during the header composing process, "m" points to IPv6 header. 429 * "mprev" points to an extension header prior to esp. 430 */ 431 u_char *nexthdrp = &ip6->ip6_nxt; 432 mprev = m; 433 434 /* 435 * we treat dest2 specially. this makes IPsec processing 436 * much easier. the goal here is to make mprev point the 437 * mbuf prior to dest2. 438 * 439 * result: IPv6 dest2 payload 440 * m and mprev will point to IPv6 header. 441 */ 442 if (exthdrs.ip6e_dest2) { 443 if (!hdrsplit) 444 panic("assumption failed: hdr not split"); 445 exthdrs.ip6e_dest2->m_next = m->m_next; 446 m->m_next = exthdrs.ip6e_dest2; 447 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 448 ip6->ip6_nxt = IPPROTO_DSTOPTS; 449 } 450 451 /* 452 * result: IPv6 hbh dest1 rthdr dest2 payload 453 * m will point to IPv6 header. mprev will point to the 454 * extension header prior to dest2 (rthdr in the above case). 455 */ 456 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 457 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 458 IPPROTO_DSTOPTS); 459 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 460 IPPROTO_ROUTING); 461 462 /* 463 * If there is a routing header, discard the packet. 464 */ 465 if (exthdrs.ip6e_rthdr) { 466 error = EINVAL; 467 goto bad; 468 } 469 470 /* Source address validation */ 471 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 472 (flags & IPV6_UNSPECSRC) == 0) { 473 error = EOPNOTSUPP; 474 IP6STAT_INC(ip6s_badscope); 475 goto bad; 476 } 477 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 478 error = EOPNOTSUPP; 479 IP6STAT_INC(ip6s_badscope); 480 goto bad; 481 } 482 483 IP6STAT_INC(ip6s_localout); 484 485 /* 486 * Route packet. 487 */ 488 if (ro == 0) { 489 ro = &ip6route; 490 bzero((caddr_t)ro, sizeof(*ro)); 491 } 492 ro_pmtu = ro; 493 if (opt && opt->ip6po_rthdr) 494 ro = &opt->ip6po_route; 495 dst = (struct sockaddr_in6 *)&ro->ro_dst; 496 #ifdef FLOWTABLE 497 if (ro->ro_rt == NULL) 498 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 499 #endif 500 again: 501 /* 502 * if specified, try to fill in the traffic class field. 503 * do not override if a non-zero value is already set. 504 * we check the diffserv field and the ecn field separately. 505 */ 506 if (opt && opt->ip6po_tclass >= 0) { 507 int mask = 0; 508 509 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 510 mask |= 0xfc; 511 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 512 mask |= 0x03; 513 if (mask != 0) 514 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 515 } 516 517 /* fill in or override the hop limit field, if necessary. */ 518 if (opt && opt->ip6po_hlim != -1) 519 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 520 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 521 if (im6o != NULL) 522 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 523 else 524 ip6->ip6_hlim = V_ip6_defmcasthlim; 525 } 526 527 /* adjust pointer */ 528 ip6 = mtod(m, struct ip6_hdr *); 529 530 if (ro->ro_rt && fwd_tag == NULL) { 531 rt = ro->ro_rt; 532 ifp = ro->ro_rt->rt_ifp; 533 } else { 534 if (fwd_tag == NULL) { 535 bzero(&dst_sa, sizeof(dst_sa)); 536 dst_sa.sin6_family = AF_INET6; 537 dst_sa.sin6_len = sizeof(dst_sa); 538 dst_sa.sin6_addr = ip6->ip6_dst; 539 } 540 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 541 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 542 if (error != 0) { 543 if (ifp != NULL) 544 in6_ifstat_inc(ifp, ifs6_out_discard); 545 goto bad; 546 } 547 } 548 if (rt == NULL) { 549 /* 550 * If in6_selectroute() does not return a route entry, 551 * dst may not have been updated. 552 */ 553 *dst = dst_sa; /* XXX */ 554 } 555 556 /* 557 * then rt (for unicast) and ifp must be non-NULL valid values. 558 */ 559 if ((flags & IPV6_FORWARDING) == 0) { 560 /* XXX: the FORWARDING flag can be set for mrouting. */ 561 in6_ifstat_inc(ifp, ifs6_out_request); 562 } 563 if (rt != NULL) { 564 ia = (struct in6_ifaddr *)(rt->rt_ifa); 565 counter_u64_add(rt->rt_pksent, 1); 566 } 567 568 /* Setup data structures for scope ID checks. */ 569 src0 = ip6->ip6_src; 570 bzero(&src_sa, sizeof(src_sa)); 571 src_sa.sin6_family = AF_INET6; 572 src_sa.sin6_len = sizeof(src_sa); 573 src_sa.sin6_addr = ip6->ip6_src; 574 575 dst0 = ip6->ip6_dst; 576 /* re-initialize to be sure */ 577 bzero(&dst_sa, sizeof(dst_sa)); 578 dst_sa.sin6_family = AF_INET6; 579 dst_sa.sin6_len = sizeof(dst_sa); 580 dst_sa.sin6_addr = ip6->ip6_dst; 581 582 /* Check for valid scope ID. */ 583 if (in6_setscope(&src0, ifp, &zone) == 0 && 584 sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id && 585 in6_setscope(&dst0, ifp, &zone) == 0 && 586 sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) { 587 /* 588 * The outgoing interface is in the zone of the source 589 * and destination addresses. 590 * 591 * Because the loopback interface cannot receive 592 * packets with a different scope ID than its own, 593 * there is a trick is to pretend the outgoing packet 594 * was received by the real network interface, by 595 * setting "origifp" different from "ifp". This is 596 * only allowed when "ifp" is a loopback network 597 * interface. Refer to code in nd6_output_ifp() for 598 * more details. 599 */ 600 origifp = ifp; 601 602 /* 603 * We should use ia_ifp to support the case of sending 604 * packets to an address of our own. 605 */ 606 if (ia != NULL && ia->ia_ifp) 607 ifp = ia->ia_ifp; 608 609 } else if ((ifp->if_flags & IFF_LOOPBACK) == 0 || 610 sa6_recoverscope(&src_sa) != 0 || 611 sa6_recoverscope(&dst_sa) != 0 || 612 dst_sa.sin6_scope_id == 0 || 613 (src_sa.sin6_scope_id != 0 && 614 src_sa.sin6_scope_id != dst_sa.sin6_scope_id) || 615 (origifp = ifnet_byindex(dst_sa.sin6_scope_id)) == NULL) { 616 /* 617 * If the destination network interface is not a 618 * loopback interface, or the destination network 619 * address has no scope ID, or the source address has 620 * a scope ID set which is different from the 621 * destination address one, or there is no network 622 * interface representing this scope ID, the address 623 * pair is considered invalid. 624 */ 625 IP6STAT_INC(ip6s_badscope); 626 in6_ifstat_inc(ifp, ifs6_out_discard); 627 if (error == 0) 628 error = EHOSTUNREACH; /* XXX */ 629 goto bad; 630 } 631 632 /* All scope ID checks are successful. */ 633 634 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 635 if (opt && opt->ip6po_nextroute.ro_rt) { 636 /* 637 * The nexthop is explicitly specified by the 638 * application. We assume the next hop is an IPv6 639 * address. 640 */ 641 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 642 } 643 else if ((rt->rt_flags & RTF_GATEWAY)) 644 dst = (struct sockaddr_in6 *)rt->rt_gateway; 645 } 646 647 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 648 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 649 } else { 650 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 651 in6_ifstat_inc(ifp, ifs6_out_mcast); 652 /* 653 * Confirm that the outgoing interface supports multicast. 654 */ 655 if (!(ifp->if_flags & IFF_MULTICAST)) { 656 IP6STAT_INC(ip6s_noroute); 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 error = ENETUNREACH; 659 goto bad; 660 } 661 if ((im6o == NULL && in6_mcast_loop) || 662 (im6o && im6o->im6o_multicast_loop)) { 663 /* 664 * Loop back multicast datagram if not expressly 665 * forbidden to do so, even if we have not joined 666 * the address; protocols will filter it later, 667 * thus deferring a hash lookup and lock acquisition 668 * at the expense of an m_copym(). 669 */ 670 ip6_mloopback(ifp, m, dst); 671 } else { 672 /* 673 * If we are acting as a multicast router, perform 674 * multicast forwarding as if the packet had just 675 * arrived on the interface to which we are about 676 * to send. The multicast forwarding function 677 * recursively calls this function, using the 678 * IPV6_FORWARDING flag to prevent infinite recursion. 679 * 680 * Multicasts that are looped back by ip6_mloopback(), 681 * above, will be forwarded by the ip6_input() routine, 682 * if necessary. 683 */ 684 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 685 /* 686 * XXX: ip6_mforward expects that rcvif is NULL 687 * when it is called from the originating path. 688 * However, it may not always be the case. 689 */ 690 m->m_pkthdr.rcvif = NULL; 691 if (ip6_mforward(ip6, ifp, m) != 0) { 692 m_freem(m); 693 goto done; 694 } 695 } 696 } 697 /* 698 * Multicasts with a hoplimit of zero may be looped back, 699 * above, but must not be transmitted on a network. 700 * Also, multicasts addressed to the loopback interface 701 * are not sent -- the above call to ip6_mloopback() will 702 * loop back a copy if this host actually belongs to the 703 * destination group on the loopback interface. 704 */ 705 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 706 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 707 m_freem(m); 708 goto done; 709 } 710 } 711 712 /* 713 * Fill the outgoing inteface to tell the upper layer 714 * to increment per-interface statistics. 715 */ 716 if (ifpp) 717 *ifpp = ifp; 718 719 /* Determine path MTU. */ 720 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 721 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 722 goto bad; 723 724 /* 725 * The caller of this function may specify to use the minimum MTU 726 * in some cases. 727 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 728 * setting. The logic is a bit complicated; by default, unicast 729 * packets will follow path MTU while multicast packets will be sent at 730 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 731 * including unicast ones will be sent at the minimum MTU. Multicast 732 * packets will always be sent at the minimum MTU unless 733 * IP6PO_MINMTU_DISABLE is explicitly specified. 734 * See RFC 3542 for more details. 735 */ 736 if (mtu > IPV6_MMTU) { 737 if ((flags & IPV6_MINMTU)) 738 mtu = IPV6_MMTU; 739 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 740 mtu = IPV6_MMTU; 741 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 742 (opt == NULL || 743 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 744 mtu = IPV6_MMTU; 745 } 746 } 747 748 /* 749 * clear embedded scope identifiers if necessary. 750 * in6_clearscope will touch the addresses only when necessary. 751 */ 752 in6_clearscope(&ip6->ip6_src); 753 in6_clearscope(&ip6->ip6_dst); 754 755 /* 756 * If the outgoing packet contains a hop-by-hop options header, 757 * it must be examined and processed even by the source node. 758 * (RFC 2460, section 4.) 759 */ 760 if (exthdrs.ip6e_hbh) { 761 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 762 u_int32_t dummy; /* XXX unused */ 763 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 764 765 #ifdef DIAGNOSTIC 766 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 767 panic("ip6e_hbh is not contiguous"); 768 #endif 769 /* 770 * XXX: if we have to send an ICMPv6 error to the sender, 771 * we need the M_LOOP flag since icmp6_error() expects 772 * the IPv6 and the hop-by-hop options header are 773 * contiguous unless the flag is set. 774 */ 775 m->m_flags |= M_LOOP; 776 m->m_pkthdr.rcvif = ifp; 777 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 778 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 779 &dummy, &plen) < 0) { 780 /* m was already freed at this point */ 781 error = EINVAL;/* better error? */ 782 goto done; 783 } 784 m->m_flags &= ~M_LOOP; /* XXX */ 785 m->m_pkthdr.rcvif = NULL; 786 } 787 788 /* Jump over all PFIL processing if hooks are not active. */ 789 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 790 goto passout; 791 792 odst = ip6->ip6_dst; 793 /* Run through list of hooks for output packets. */ 794 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 795 if (error != 0 || m == NULL) 796 goto done; 797 ip6 = mtod(m, struct ip6_hdr *); 798 799 /* See if destination IP address was changed by packet filter. */ 800 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 801 m->m_flags |= M_SKIP_FIREWALL; 802 /* If destination is now ourself drop to ip6_input(). */ 803 if (in6_localip(&ip6->ip6_dst)) { 804 m->m_flags |= M_FASTFWD_OURS; 805 if (m->m_pkthdr.rcvif == NULL) 806 m->m_pkthdr.rcvif = V_loif; 807 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 808 m->m_pkthdr.csum_flags |= 809 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 810 m->m_pkthdr.csum_data = 0xffff; 811 } 812 #ifdef SCTP 813 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 814 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 815 #endif 816 error = netisr_queue(NETISR_IPV6, m); 817 goto done; 818 } else 819 goto again; /* Redo the routing table lookup. */ 820 } 821 822 /* See if local, if yes, send it to netisr. */ 823 if (m->m_flags & M_FASTFWD_OURS) { 824 if (m->m_pkthdr.rcvif == NULL) 825 m->m_pkthdr.rcvif = V_loif; 826 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 827 m->m_pkthdr.csum_flags |= 828 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 829 m->m_pkthdr.csum_data = 0xffff; 830 } 831 #ifdef SCTP 832 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 833 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 834 #endif 835 error = netisr_queue(NETISR_IPV6, m); 836 goto done; 837 } 838 /* Or forward to some other address? */ 839 if ((m->m_flags & M_IP6_NEXTHOP) && 840 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 841 dst = (struct sockaddr_in6 *)&ro->ro_dst; 842 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 843 m->m_flags |= M_SKIP_FIREWALL; 844 m->m_flags &= ~M_IP6_NEXTHOP; 845 m_tag_delete(m, fwd_tag); 846 goto again; 847 } 848 849 passout: 850 /* 851 * Send the packet to the outgoing interface. 852 * If necessary, do IPv6 fragmentation before sending. 853 * 854 * the logic here is rather complex: 855 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 856 * 1-a: send as is if tlen <= path mtu 857 * 1-b: fragment if tlen > path mtu 858 * 859 * 2: if user asks us not to fragment (dontfrag == 1) 860 * 2-a: send as is if tlen <= interface mtu 861 * 2-b: error if tlen > interface mtu 862 * 863 * 3: if we always need to attach fragment header (alwaysfrag == 1) 864 * always fragment 865 * 866 * 4: if dontfrag == 1 && alwaysfrag == 1 867 * error, as we cannot handle this conflicting request 868 */ 869 sw_csum = m->m_pkthdr.csum_flags; 870 if (!hdrsplit) { 871 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 872 sw_csum &= ~ifp->if_hwassist; 873 } else 874 tso = 0; 875 /* 876 * If we added extension headers, we will not do TSO and calculate the 877 * checksums ourselves for now. 878 * XXX-BZ Need a framework to know when the NIC can handle it, even 879 * with ext. hdrs. 880 */ 881 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 882 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 883 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 884 } 885 #ifdef SCTP 886 if (sw_csum & CSUM_SCTP_IPV6) { 887 sw_csum &= ~CSUM_SCTP_IPV6; 888 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 889 } 890 #endif 891 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 892 tlen = m->m_pkthdr.len; 893 894 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 895 dontfrag = 1; 896 else 897 dontfrag = 0; 898 if (dontfrag && alwaysfrag) { /* case 4 */ 899 /* conflicting request - can't transmit */ 900 error = EMSGSIZE; 901 goto bad; 902 } 903 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 904 /* 905 * Even if the DONTFRAG option is specified, we cannot send the 906 * packet when the data length is larger than the MTU of the 907 * outgoing interface. 908 * Notify the error by sending IPV6_PATHMTU ancillary data if 909 * application wanted to know the MTU value. Also return an 910 * error code (this is not described in the API spec). 911 */ 912 if (inp != NULL) 913 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 914 error = EMSGSIZE; 915 goto bad; 916 } 917 918 /* 919 * transmit packet without fragmentation 920 */ 921 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 922 struct in6_ifaddr *ia6; 923 924 ip6 = mtod(m, struct ip6_hdr *); 925 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 926 if (ia6) { 927 /* Record statistics for this interface address. */ 928 ia6->ia_ifa.if_opackets++; 929 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 930 ifa_free(&ia6->ia_ifa); 931 } 932 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 933 goto done; 934 } 935 936 /* 937 * try to fragment the packet. case 1-b and 3 938 */ 939 if (mtu < IPV6_MMTU) { 940 /* path MTU cannot be less than IPV6_MMTU */ 941 error = EMSGSIZE; 942 in6_ifstat_inc(ifp, ifs6_out_fragfail); 943 goto bad; 944 } else if (ip6->ip6_plen == 0) { 945 /* jumbo payload cannot be fragmented */ 946 error = EMSGSIZE; 947 in6_ifstat_inc(ifp, ifs6_out_fragfail); 948 goto bad; 949 } else { 950 u_char nextproto; 951 952 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 953 954 /* 955 * Too large for the destination or interface; 956 * fragment if possible. 957 * Must be able to put at least 8 bytes per fragment. 958 */ 959 hlen = unfragpartlen; 960 if (mtu > IPV6_MAXPACKET) 961 mtu = IPV6_MAXPACKET; 962 963 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 964 if (len < 8) { 965 error = EMSGSIZE; 966 in6_ifstat_inc(ifp, ifs6_out_fragfail); 967 goto bad; 968 } 969 970 /* 971 * Verify that we have any chance at all of being able to queue 972 * the packet or packet fragments 973 */ 974 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 975 < tlen /* - hlen */)) { 976 error = ENOBUFS; 977 IP6STAT_INC(ip6s_odropped); 978 goto bad; 979 } 980 981 982 /* 983 * If the interface will not calculate checksums on 984 * fragmented packets, then do it here. 985 * XXX-BZ handle the hw offloading case. Need flags. 986 */ 987 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 988 in6_delayed_cksum(m, plen, hlen); 989 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 990 } 991 #ifdef SCTP 992 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 993 sctp_delayed_cksum(m, hlen); 994 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 995 } 996 #endif 997 /* 998 * Change the next header field of the last header in the 999 * unfragmentable part. 1000 */ 1001 if (exthdrs.ip6e_rthdr) { 1002 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1003 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1004 } else if (exthdrs.ip6e_dest1) { 1005 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1006 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1007 } else if (exthdrs.ip6e_hbh) { 1008 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1009 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1010 } else { 1011 nextproto = ip6->ip6_nxt; 1012 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1013 } 1014 1015 /* 1016 * Loop through length of segment after first fragment, 1017 * make new header and copy data of each part and link onto 1018 * chain. 1019 */ 1020 m0 = m; 1021 id = htonl(ip6_randomid()); 1022 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id))) 1023 goto sendorfree; 1024 1025 in6_ifstat_inc(ifp, ifs6_out_fragok); 1026 } 1027 1028 /* 1029 * Remove leading garbages. 1030 */ 1031 sendorfree: 1032 m = m0->m_nextpkt; 1033 m0->m_nextpkt = 0; 1034 m_freem(m0); 1035 for (m0 = m; m; m = m0) { 1036 m0 = m->m_nextpkt; 1037 m->m_nextpkt = 0; 1038 if (error == 0) { 1039 /* Record statistics for this interface address. */ 1040 if (ia) { 1041 ia->ia_ifa.if_opackets++; 1042 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1043 } 1044 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1045 } else 1046 m_freem(m); 1047 } 1048 1049 if (error == 0) 1050 IP6STAT_INC(ip6s_fragmented); 1051 1052 done: 1053 if (ro == &ip6route) 1054 RO_RTFREE(ro); 1055 if (ro_pmtu == &ip6route) 1056 RO_RTFREE(ro_pmtu); 1057 return (error); 1058 1059 freehdrs: 1060 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1061 m_freem(exthdrs.ip6e_dest1); 1062 m_freem(exthdrs.ip6e_rthdr); 1063 m_freem(exthdrs.ip6e_dest2); 1064 /* FALLTHROUGH */ 1065 bad: 1066 if (m) 1067 m_freem(m); 1068 goto done; 1069 } 1070 1071 static int 1072 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1073 { 1074 struct mbuf *m; 1075 1076 if (hlen > MCLBYTES) 1077 return (ENOBUFS); /* XXX */ 1078 1079 if (hlen > MLEN) 1080 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1081 else 1082 m = m_get(M_NOWAIT, MT_DATA); 1083 if (m == NULL) 1084 return (ENOBUFS); 1085 m->m_len = hlen; 1086 if (hdr) 1087 bcopy(hdr, mtod(m, caddr_t), hlen); 1088 1089 *mp = m; 1090 return (0); 1091 } 1092 1093 /* 1094 * Insert jumbo payload option. 1095 */ 1096 static int 1097 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1098 { 1099 struct mbuf *mopt; 1100 u_char *optbuf; 1101 u_int32_t v; 1102 1103 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1104 1105 /* 1106 * If there is no hop-by-hop options header, allocate new one. 1107 * If there is one but it doesn't have enough space to store the 1108 * jumbo payload option, allocate a cluster to store the whole options. 1109 * Otherwise, use it to store the options. 1110 */ 1111 if (exthdrs->ip6e_hbh == 0) { 1112 mopt = m_get(M_NOWAIT, MT_DATA); 1113 if (mopt == NULL) 1114 return (ENOBUFS); 1115 mopt->m_len = JUMBOOPTLEN; 1116 optbuf = mtod(mopt, u_char *); 1117 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1118 exthdrs->ip6e_hbh = mopt; 1119 } else { 1120 struct ip6_hbh *hbh; 1121 1122 mopt = exthdrs->ip6e_hbh; 1123 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1124 /* 1125 * XXX assumption: 1126 * - exthdrs->ip6e_hbh is not referenced from places 1127 * other than exthdrs. 1128 * - exthdrs->ip6e_hbh is not an mbuf chain. 1129 */ 1130 int oldoptlen = mopt->m_len; 1131 struct mbuf *n; 1132 1133 /* 1134 * XXX: give up if the whole (new) hbh header does 1135 * not fit even in an mbuf cluster. 1136 */ 1137 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1138 return (ENOBUFS); 1139 1140 /* 1141 * As a consequence, we must always prepare a cluster 1142 * at this point. 1143 */ 1144 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1145 if (n == NULL) 1146 return (ENOBUFS); 1147 n->m_len = oldoptlen + JUMBOOPTLEN; 1148 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1149 oldoptlen); 1150 optbuf = mtod(n, caddr_t) + oldoptlen; 1151 m_freem(mopt); 1152 mopt = exthdrs->ip6e_hbh = n; 1153 } else { 1154 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1155 mopt->m_len += JUMBOOPTLEN; 1156 } 1157 optbuf[0] = IP6OPT_PADN; 1158 optbuf[1] = 1; 1159 1160 /* 1161 * Adjust the header length according to the pad and 1162 * the jumbo payload option. 1163 */ 1164 hbh = mtod(mopt, struct ip6_hbh *); 1165 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1166 } 1167 1168 /* fill in the option. */ 1169 optbuf[2] = IP6OPT_JUMBO; 1170 optbuf[3] = 4; 1171 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1172 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1173 1174 /* finally, adjust the packet header length */ 1175 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1176 1177 return (0); 1178 #undef JUMBOOPTLEN 1179 } 1180 1181 /* 1182 * Insert fragment header and copy unfragmentable header portions. 1183 */ 1184 static int 1185 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1186 struct ip6_frag **frghdrp) 1187 { 1188 struct mbuf *n, *mlast; 1189 1190 if (hlen > sizeof(struct ip6_hdr)) { 1191 n = m_copym(m0, sizeof(struct ip6_hdr), 1192 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1193 if (n == 0) 1194 return (ENOBUFS); 1195 m->m_next = n; 1196 } else 1197 n = m; 1198 1199 /* Search for the last mbuf of unfragmentable part. */ 1200 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1201 ; 1202 1203 if ((mlast->m_flags & M_EXT) == 0 && 1204 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1205 /* use the trailing space of the last mbuf for the fragment hdr */ 1206 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1207 mlast->m_len); 1208 mlast->m_len += sizeof(struct ip6_frag); 1209 m->m_pkthdr.len += sizeof(struct ip6_frag); 1210 } else { 1211 /* allocate a new mbuf for the fragment header */ 1212 struct mbuf *mfrg; 1213 1214 mfrg = m_get(M_NOWAIT, MT_DATA); 1215 if (mfrg == NULL) 1216 return (ENOBUFS); 1217 mfrg->m_len = sizeof(struct ip6_frag); 1218 *frghdrp = mtod(mfrg, struct ip6_frag *); 1219 mlast->m_next = mfrg; 1220 } 1221 1222 return (0); 1223 } 1224 1225 static int 1226 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1227 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1228 int *alwaysfragp, u_int fibnum) 1229 { 1230 u_int32_t mtu = 0; 1231 int alwaysfrag = 0; 1232 int error = 0; 1233 1234 if (ro_pmtu != ro) { 1235 /* The first hop and the final destination may differ. */ 1236 struct sockaddr_in6 *sa6_dst = 1237 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1238 if (ro_pmtu->ro_rt && 1239 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1240 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1241 RTFREE(ro_pmtu->ro_rt); 1242 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1243 } 1244 if (ro_pmtu->ro_rt == NULL) { 1245 bzero(sa6_dst, sizeof(*sa6_dst)); 1246 sa6_dst->sin6_family = AF_INET6; 1247 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1248 sa6_dst->sin6_addr = *dst; 1249 1250 in6_rtalloc(ro_pmtu, fibnum); 1251 } 1252 } 1253 if (ro_pmtu->ro_rt) { 1254 u_int32_t ifmtu; 1255 struct in_conninfo inc; 1256 1257 bzero(&inc, sizeof(inc)); 1258 inc.inc_flags |= INC_ISIPV6; 1259 inc.inc6_faddr = *dst; 1260 1261 if (ifp == NULL) 1262 ifp = ro_pmtu->ro_rt->rt_ifp; 1263 ifmtu = IN6_LINKMTU(ifp); 1264 mtu = tcp_hc_getmtu(&inc); 1265 if (mtu) 1266 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu); 1267 else 1268 mtu = ro_pmtu->ro_rt->rt_mtu; 1269 if (mtu == 0) 1270 mtu = ifmtu; 1271 else if (mtu < IPV6_MMTU) { 1272 /* 1273 * RFC2460 section 5, last paragraph: 1274 * if we record ICMPv6 too big message with 1275 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1276 * or smaller, with framgent header attached. 1277 * (fragment header is needed regardless from the 1278 * packet size, for translators to identify packets) 1279 */ 1280 alwaysfrag = 1; 1281 mtu = IPV6_MMTU; 1282 } else if (mtu > ifmtu) { 1283 /* 1284 * The MTU on the route is larger than the MTU on 1285 * the interface! This shouldn't happen, unless the 1286 * MTU of the interface has been changed after the 1287 * interface was brought up. Change the MTU in the 1288 * route to match the interface MTU (as long as the 1289 * field isn't locked). 1290 */ 1291 mtu = ifmtu; 1292 ro_pmtu->ro_rt->rt_mtu = mtu; 1293 } 1294 } else if (ifp) { 1295 mtu = IN6_LINKMTU(ifp); 1296 } else 1297 error = EHOSTUNREACH; /* XXX */ 1298 1299 *mtup = mtu; 1300 if (alwaysfragp) 1301 *alwaysfragp = alwaysfrag; 1302 return (error); 1303 } 1304 1305 /* 1306 * IP6 socket option processing. 1307 */ 1308 int 1309 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1310 { 1311 int optdatalen, uproto; 1312 void *optdata; 1313 struct inpcb *in6p = sotoinpcb(so); 1314 int error, optval; 1315 int level, op, optname; 1316 int optlen; 1317 struct thread *td; 1318 1319 level = sopt->sopt_level; 1320 op = sopt->sopt_dir; 1321 optname = sopt->sopt_name; 1322 optlen = sopt->sopt_valsize; 1323 td = sopt->sopt_td; 1324 error = 0; 1325 optval = 0; 1326 uproto = (int)so->so_proto->pr_protocol; 1327 1328 if (level != IPPROTO_IPV6) { 1329 error = EINVAL; 1330 1331 if (sopt->sopt_level == SOL_SOCKET && 1332 sopt->sopt_dir == SOPT_SET) { 1333 switch (sopt->sopt_name) { 1334 case SO_REUSEADDR: 1335 INP_WLOCK(in6p); 1336 if ((so->so_options & SO_REUSEADDR) != 0) 1337 in6p->inp_flags2 |= INP_REUSEADDR; 1338 else 1339 in6p->inp_flags2 &= ~INP_REUSEADDR; 1340 INP_WUNLOCK(in6p); 1341 error = 0; 1342 break; 1343 case SO_REUSEPORT: 1344 INP_WLOCK(in6p); 1345 if ((so->so_options & SO_REUSEPORT) != 0) 1346 in6p->inp_flags2 |= INP_REUSEPORT; 1347 else 1348 in6p->inp_flags2 &= ~INP_REUSEPORT; 1349 INP_WUNLOCK(in6p); 1350 error = 0; 1351 break; 1352 case SO_SETFIB: 1353 INP_WLOCK(in6p); 1354 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1355 INP_WUNLOCK(in6p); 1356 error = 0; 1357 break; 1358 default: 1359 break; 1360 } 1361 } 1362 } else { /* level == IPPROTO_IPV6 */ 1363 switch (op) { 1364 1365 case SOPT_SET: 1366 switch (optname) { 1367 case IPV6_2292PKTOPTIONS: 1368 #ifdef IPV6_PKTOPTIONS 1369 case IPV6_PKTOPTIONS: 1370 #endif 1371 { 1372 struct mbuf *m; 1373 1374 error = soopt_getm(sopt, &m); /* XXX */ 1375 if (error != 0) 1376 break; 1377 error = soopt_mcopyin(sopt, m); /* XXX */ 1378 if (error != 0) 1379 break; 1380 error = ip6_pcbopts(&in6p->in6p_outputopts, 1381 m, so, sopt); 1382 m_freem(m); /* XXX */ 1383 break; 1384 } 1385 1386 /* 1387 * Use of some Hop-by-Hop options or some 1388 * Destination options, might require special 1389 * privilege. That is, normal applications 1390 * (without special privilege) might be forbidden 1391 * from setting certain options in outgoing packets, 1392 * and might never see certain options in received 1393 * packets. [RFC 2292 Section 6] 1394 * KAME specific note: 1395 * KAME prevents non-privileged users from sending or 1396 * receiving ANY hbh/dst options in order to avoid 1397 * overhead of parsing options in the kernel. 1398 */ 1399 case IPV6_RECVHOPOPTS: 1400 case IPV6_RECVDSTOPTS: 1401 case IPV6_RECVRTHDRDSTOPTS: 1402 if (td != NULL) { 1403 error = priv_check(td, 1404 PRIV_NETINET_SETHDROPTS); 1405 if (error) 1406 break; 1407 } 1408 /* FALLTHROUGH */ 1409 case IPV6_UNICAST_HOPS: 1410 case IPV6_HOPLIMIT: 1411 case IPV6_FAITH: 1412 1413 case IPV6_RECVPKTINFO: 1414 case IPV6_RECVHOPLIMIT: 1415 case IPV6_RECVRTHDR: 1416 case IPV6_RECVPATHMTU: 1417 case IPV6_RECVTCLASS: 1418 case IPV6_V6ONLY: 1419 case IPV6_AUTOFLOWLABEL: 1420 case IPV6_BINDANY: 1421 if (optname == IPV6_BINDANY && td != NULL) { 1422 error = priv_check(td, 1423 PRIV_NETINET_BINDANY); 1424 if (error) 1425 break; 1426 } 1427 1428 if (optlen != sizeof(int)) { 1429 error = EINVAL; 1430 break; 1431 } 1432 error = sooptcopyin(sopt, &optval, 1433 sizeof optval, sizeof optval); 1434 if (error) 1435 break; 1436 switch (optname) { 1437 1438 case IPV6_UNICAST_HOPS: 1439 if (optval < -1 || optval >= 256) 1440 error = EINVAL; 1441 else { 1442 /* -1 = kernel default */ 1443 in6p->in6p_hops = optval; 1444 if ((in6p->inp_vflag & 1445 INP_IPV4) != 0) 1446 in6p->inp_ip_ttl = optval; 1447 } 1448 break; 1449 #define OPTSET(bit) \ 1450 do { \ 1451 INP_WLOCK(in6p); \ 1452 if (optval) \ 1453 in6p->inp_flags |= (bit); \ 1454 else \ 1455 in6p->inp_flags &= ~(bit); \ 1456 INP_WUNLOCK(in6p); \ 1457 } while (/*CONSTCOND*/ 0) 1458 #define OPTSET2292(bit) \ 1459 do { \ 1460 INP_WLOCK(in6p); \ 1461 in6p->inp_flags |= IN6P_RFC2292; \ 1462 if (optval) \ 1463 in6p->inp_flags |= (bit); \ 1464 else \ 1465 in6p->inp_flags &= ~(bit); \ 1466 INP_WUNLOCK(in6p); \ 1467 } while (/*CONSTCOND*/ 0) 1468 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1469 1470 case IPV6_RECVPKTINFO: 1471 /* cannot mix with RFC2292 */ 1472 if (OPTBIT(IN6P_RFC2292)) { 1473 error = EINVAL; 1474 break; 1475 } 1476 OPTSET(IN6P_PKTINFO); 1477 break; 1478 1479 case IPV6_HOPLIMIT: 1480 { 1481 struct ip6_pktopts **optp; 1482 1483 /* cannot mix with RFC2292 */ 1484 if (OPTBIT(IN6P_RFC2292)) { 1485 error = EINVAL; 1486 break; 1487 } 1488 optp = &in6p->in6p_outputopts; 1489 error = ip6_pcbopt(IPV6_HOPLIMIT, 1490 (u_char *)&optval, sizeof(optval), 1491 optp, (td != NULL) ? td->td_ucred : 1492 NULL, uproto); 1493 break; 1494 } 1495 1496 case IPV6_RECVHOPLIMIT: 1497 /* cannot mix with RFC2292 */ 1498 if (OPTBIT(IN6P_RFC2292)) { 1499 error = EINVAL; 1500 break; 1501 } 1502 OPTSET(IN6P_HOPLIMIT); 1503 break; 1504 1505 case IPV6_RECVHOPOPTS: 1506 /* cannot mix with RFC2292 */ 1507 if (OPTBIT(IN6P_RFC2292)) { 1508 error = EINVAL; 1509 break; 1510 } 1511 OPTSET(IN6P_HOPOPTS); 1512 break; 1513 1514 case IPV6_RECVDSTOPTS: 1515 /* cannot mix with RFC2292 */ 1516 if (OPTBIT(IN6P_RFC2292)) { 1517 error = EINVAL; 1518 break; 1519 } 1520 OPTSET(IN6P_DSTOPTS); 1521 break; 1522 1523 case IPV6_RECVRTHDRDSTOPTS: 1524 /* cannot mix with RFC2292 */ 1525 if (OPTBIT(IN6P_RFC2292)) { 1526 error = EINVAL; 1527 break; 1528 } 1529 OPTSET(IN6P_RTHDRDSTOPTS); 1530 break; 1531 1532 case IPV6_RECVRTHDR: 1533 /* cannot mix with RFC2292 */ 1534 if (OPTBIT(IN6P_RFC2292)) { 1535 error = EINVAL; 1536 break; 1537 } 1538 OPTSET(IN6P_RTHDR); 1539 break; 1540 1541 case IPV6_FAITH: 1542 OPTSET(INP_FAITH); 1543 break; 1544 1545 case IPV6_RECVPATHMTU: 1546 /* 1547 * We ignore this option for TCP 1548 * sockets. 1549 * (RFC3542 leaves this case 1550 * unspecified.) 1551 */ 1552 if (uproto != IPPROTO_TCP) 1553 OPTSET(IN6P_MTU); 1554 break; 1555 1556 case IPV6_V6ONLY: 1557 /* 1558 * make setsockopt(IPV6_V6ONLY) 1559 * available only prior to bind(2). 1560 * see ipng mailing list, Jun 22 2001. 1561 */ 1562 if (in6p->inp_lport || 1563 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1564 error = EINVAL; 1565 break; 1566 } 1567 OPTSET(IN6P_IPV6_V6ONLY); 1568 if (optval) 1569 in6p->inp_vflag &= ~INP_IPV4; 1570 else 1571 in6p->inp_vflag |= INP_IPV4; 1572 break; 1573 case IPV6_RECVTCLASS: 1574 /* cannot mix with RFC2292 XXX */ 1575 if (OPTBIT(IN6P_RFC2292)) { 1576 error = EINVAL; 1577 break; 1578 } 1579 OPTSET(IN6P_TCLASS); 1580 break; 1581 case IPV6_AUTOFLOWLABEL: 1582 OPTSET(IN6P_AUTOFLOWLABEL); 1583 break; 1584 1585 case IPV6_BINDANY: 1586 OPTSET(INP_BINDANY); 1587 break; 1588 } 1589 break; 1590 1591 case IPV6_TCLASS: 1592 case IPV6_DONTFRAG: 1593 case IPV6_USE_MIN_MTU: 1594 case IPV6_PREFER_TEMPADDR: 1595 if (optlen != sizeof(optval)) { 1596 error = EINVAL; 1597 break; 1598 } 1599 error = sooptcopyin(sopt, &optval, 1600 sizeof optval, sizeof optval); 1601 if (error) 1602 break; 1603 { 1604 struct ip6_pktopts **optp; 1605 optp = &in6p->in6p_outputopts; 1606 error = ip6_pcbopt(optname, 1607 (u_char *)&optval, sizeof(optval), 1608 optp, (td != NULL) ? td->td_ucred : 1609 NULL, uproto); 1610 break; 1611 } 1612 1613 case IPV6_2292PKTINFO: 1614 case IPV6_2292HOPLIMIT: 1615 case IPV6_2292HOPOPTS: 1616 case IPV6_2292DSTOPTS: 1617 case IPV6_2292RTHDR: 1618 /* RFC 2292 */ 1619 if (optlen != sizeof(int)) { 1620 error = EINVAL; 1621 break; 1622 } 1623 error = sooptcopyin(sopt, &optval, 1624 sizeof optval, sizeof optval); 1625 if (error) 1626 break; 1627 switch (optname) { 1628 case IPV6_2292PKTINFO: 1629 OPTSET2292(IN6P_PKTINFO); 1630 break; 1631 case IPV6_2292HOPLIMIT: 1632 OPTSET2292(IN6P_HOPLIMIT); 1633 break; 1634 case IPV6_2292HOPOPTS: 1635 /* 1636 * Check super-user privilege. 1637 * See comments for IPV6_RECVHOPOPTS. 1638 */ 1639 if (td != NULL) { 1640 error = priv_check(td, 1641 PRIV_NETINET_SETHDROPTS); 1642 if (error) 1643 return (error); 1644 } 1645 OPTSET2292(IN6P_HOPOPTS); 1646 break; 1647 case IPV6_2292DSTOPTS: 1648 if (td != NULL) { 1649 error = priv_check(td, 1650 PRIV_NETINET_SETHDROPTS); 1651 if (error) 1652 return (error); 1653 } 1654 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1655 break; 1656 case IPV6_2292RTHDR: 1657 OPTSET2292(IN6P_RTHDR); 1658 break; 1659 } 1660 break; 1661 case IPV6_PKTINFO: 1662 case IPV6_HOPOPTS: 1663 case IPV6_RTHDR: 1664 case IPV6_DSTOPTS: 1665 case IPV6_RTHDRDSTOPTS: 1666 case IPV6_NEXTHOP: 1667 { 1668 /* new advanced API (RFC3542) */ 1669 u_char *optbuf; 1670 u_char optbuf_storage[MCLBYTES]; 1671 int optlen; 1672 struct ip6_pktopts **optp; 1673 1674 /* cannot mix with RFC2292 */ 1675 if (OPTBIT(IN6P_RFC2292)) { 1676 error = EINVAL; 1677 break; 1678 } 1679 1680 /* 1681 * We only ensure valsize is not too large 1682 * here. Further validation will be done 1683 * later. 1684 */ 1685 error = sooptcopyin(sopt, optbuf_storage, 1686 sizeof(optbuf_storage), 0); 1687 if (error) 1688 break; 1689 optlen = sopt->sopt_valsize; 1690 optbuf = optbuf_storage; 1691 optp = &in6p->in6p_outputopts; 1692 error = ip6_pcbopt(optname, optbuf, optlen, 1693 optp, (td != NULL) ? td->td_ucred : NULL, 1694 uproto); 1695 break; 1696 } 1697 #undef OPTSET 1698 1699 case IPV6_MULTICAST_IF: 1700 case IPV6_MULTICAST_HOPS: 1701 case IPV6_MULTICAST_LOOP: 1702 case IPV6_JOIN_GROUP: 1703 case IPV6_LEAVE_GROUP: 1704 case IPV6_MSFILTER: 1705 case MCAST_BLOCK_SOURCE: 1706 case MCAST_UNBLOCK_SOURCE: 1707 case MCAST_JOIN_GROUP: 1708 case MCAST_LEAVE_GROUP: 1709 case MCAST_JOIN_SOURCE_GROUP: 1710 case MCAST_LEAVE_SOURCE_GROUP: 1711 error = ip6_setmoptions(in6p, sopt); 1712 break; 1713 1714 case IPV6_PORTRANGE: 1715 error = sooptcopyin(sopt, &optval, 1716 sizeof optval, sizeof optval); 1717 if (error) 1718 break; 1719 1720 INP_WLOCK(in6p); 1721 switch (optval) { 1722 case IPV6_PORTRANGE_DEFAULT: 1723 in6p->inp_flags &= ~(INP_LOWPORT); 1724 in6p->inp_flags &= ~(INP_HIGHPORT); 1725 break; 1726 1727 case IPV6_PORTRANGE_HIGH: 1728 in6p->inp_flags &= ~(INP_LOWPORT); 1729 in6p->inp_flags |= INP_HIGHPORT; 1730 break; 1731 1732 case IPV6_PORTRANGE_LOW: 1733 in6p->inp_flags &= ~(INP_HIGHPORT); 1734 in6p->inp_flags |= INP_LOWPORT; 1735 break; 1736 1737 default: 1738 error = EINVAL; 1739 break; 1740 } 1741 INP_WUNLOCK(in6p); 1742 break; 1743 1744 #ifdef IPSEC 1745 case IPV6_IPSEC_POLICY: 1746 { 1747 caddr_t req; 1748 struct mbuf *m; 1749 1750 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1751 break; 1752 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1753 break; 1754 req = mtod(m, caddr_t); 1755 error = ipsec_set_policy(in6p, optname, req, 1756 m->m_len, (sopt->sopt_td != NULL) ? 1757 sopt->sopt_td->td_ucred : NULL); 1758 m_freem(m); 1759 break; 1760 } 1761 #endif /* IPSEC */ 1762 1763 default: 1764 error = ENOPROTOOPT; 1765 break; 1766 } 1767 break; 1768 1769 case SOPT_GET: 1770 switch (optname) { 1771 1772 case IPV6_2292PKTOPTIONS: 1773 #ifdef IPV6_PKTOPTIONS 1774 case IPV6_PKTOPTIONS: 1775 #endif 1776 /* 1777 * RFC3542 (effectively) deprecated the 1778 * semantics of the 2292-style pktoptions. 1779 * Since it was not reliable in nature (i.e., 1780 * applications had to expect the lack of some 1781 * information after all), it would make sense 1782 * to simplify this part by always returning 1783 * empty data. 1784 */ 1785 sopt->sopt_valsize = 0; 1786 break; 1787 1788 case IPV6_RECVHOPOPTS: 1789 case IPV6_RECVDSTOPTS: 1790 case IPV6_RECVRTHDRDSTOPTS: 1791 case IPV6_UNICAST_HOPS: 1792 case IPV6_RECVPKTINFO: 1793 case IPV6_RECVHOPLIMIT: 1794 case IPV6_RECVRTHDR: 1795 case IPV6_RECVPATHMTU: 1796 1797 case IPV6_FAITH: 1798 case IPV6_V6ONLY: 1799 case IPV6_PORTRANGE: 1800 case IPV6_RECVTCLASS: 1801 case IPV6_AUTOFLOWLABEL: 1802 case IPV6_BINDANY: 1803 switch (optname) { 1804 1805 case IPV6_RECVHOPOPTS: 1806 optval = OPTBIT(IN6P_HOPOPTS); 1807 break; 1808 1809 case IPV6_RECVDSTOPTS: 1810 optval = OPTBIT(IN6P_DSTOPTS); 1811 break; 1812 1813 case IPV6_RECVRTHDRDSTOPTS: 1814 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1815 break; 1816 1817 case IPV6_UNICAST_HOPS: 1818 optval = in6p->in6p_hops; 1819 break; 1820 1821 case IPV6_RECVPKTINFO: 1822 optval = OPTBIT(IN6P_PKTINFO); 1823 break; 1824 1825 case IPV6_RECVHOPLIMIT: 1826 optval = OPTBIT(IN6P_HOPLIMIT); 1827 break; 1828 1829 case IPV6_RECVRTHDR: 1830 optval = OPTBIT(IN6P_RTHDR); 1831 break; 1832 1833 case IPV6_RECVPATHMTU: 1834 optval = OPTBIT(IN6P_MTU); 1835 break; 1836 1837 case IPV6_FAITH: 1838 optval = OPTBIT(INP_FAITH); 1839 break; 1840 1841 case IPV6_V6ONLY: 1842 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1843 break; 1844 1845 case IPV6_PORTRANGE: 1846 { 1847 int flags; 1848 flags = in6p->inp_flags; 1849 if (flags & INP_HIGHPORT) 1850 optval = IPV6_PORTRANGE_HIGH; 1851 else if (flags & INP_LOWPORT) 1852 optval = IPV6_PORTRANGE_LOW; 1853 else 1854 optval = 0; 1855 break; 1856 } 1857 case IPV6_RECVTCLASS: 1858 optval = OPTBIT(IN6P_TCLASS); 1859 break; 1860 1861 case IPV6_AUTOFLOWLABEL: 1862 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1863 break; 1864 1865 case IPV6_BINDANY: 1866 optval = OPTBIT(INP_BINDANY); 1867 break; 1868 } 1869 if (error) 1870 break; 1871 error = sooptcopyout(sopt, &optval, 1872 sizeof optval); 1873 break; 1874 1875 case IPV6_PATHMTU: 1876 { 1877 u_long pmtu = 0; 1878 struct ip6_mtuinfo mtuinfo; 1879 struct route_in6 sro; 1880 1881 bzero(&sro, sizeof(sro)); 1882 1883 if (!(so->so_state & SS_ISCONNECTED)) 1884 return (ENOTCONN); 1885 /* 1886 * XXX: we dot not consider the case of source 1887 * routing, or optional information to specify 1888 * the outgoing interface. 1889 */ 1890 error = ip6_getpmtu(&sro, NULL, NULL, 1891 &in6p->in6p_faddr, &pmtu, NULL, 1892 so->so_fibnum); 1893 if (sro.ro_rt) 1894 RTFREE(sro.ro_rt); 1895 if (error) 1896 break; 1897 if (pmtu > IPV6_MAXPACKET) 1898 pmtu = IPV6_MAXPACKET; 1899 1900 bzero(&mtuinfo, sizeof(mtuinfo)); 1901 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1902 optdata = (void *)&mtuinfo; 1903 optdatalen = sizeof(mtuinfo); 1904 error = sooptcopyout(sopt, optdata, 1905 optdatalen); 1906 break; 1907 } 1908 1909 case IPV6_2292PKTINFO: 1910 case IPV6_2292HOPLIMIT: 1911 case IPV6_2292HOPOPTS: 1912 case IPV6_2292RTHDR: 1913 case IPV6_2292DSTOPTS: 1914 switch (optname) { 1915 case IPV6_2292PKTINFO: 1916 optval = OPTBIT(IN6P_PKTINFO); 1917 break; 1918 case IPV6_2292HOPLIMIT: 1919 optval = OPTBIT(IN6P_HOPLIMIT); 1920 break; 1921 case IPV6_2292HOPOPTS: 1922 optval = OPTBIT(IN6P_HOPOPTS); 1923 break; 1924 case IPV6_2292RTHDR: 1925 optval = OPTBIT(IN6P_RTHDR); 1926 break; 1927 case IPV6_2292DSTOPTS: 1928 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1929 break; 1930 } 1931 error = sooptcopyout(sopt, &optval, 1932 sizeof optval); 1933 break; 1934 case IPV6_PKTINFO: 1935 case IPV6_HOPOPTS: 1936 case IPV6_RTHDR: 1937 case IPV6_DSTOPTS: 1938 case IPV6_RTHDRDSTOPTS: 1939 case IPV6_NEXTHOP: 1940 case IPV6_TCLASS: 1941 case IPV6_DONTFRAG: 1942 case IPV6_USE_MIN_MTU: 1943 case IPV6_PREFER_TEMPADDR: 1944 error = ip6_getpcbopt(in6p->in6p_outputopts, 1945 optname, sopt); 1946 break; 1947 1948 case IPV6_MULTICAST_IF: 1949 case IPV6_MULTICAST_HOPS: 1950 case IPV6_MULTICAST_LOOP: 1951 case IPV6_MSFILTER: 1952 error = ip6_getmoptions(in6p, sopt); 1953 break; 1954 1955 #ifdef IPSEC 1956 case IPV6_IPSEC_POLICY: 1957 { 1958 caddr_t req = NULL; 1959 size_t len = 0; 1960 struct mbuf *m = NULL; 1961 struct mbuf **mp = &m; 1962 size_t ovalsize = sopt->sopt_valsize; 1963 caddr_t oval = (caddr_t)sopt->sopt_val; 1964 1965 error = soopt_getm(sopt, &m); /* XXX */ 1966 if (error != 0) 1967 break; 1968 error = soopt_mcopyin(sopt, m); /* XXX */ 1969 if (error != 0) 1970 break; 1971 sopt->sopt_valsize = ovalsize; 1972 sopt->sopt_val = oval; 1973 if (m) { 1974 req = mtod(m, caddr_t); 1975 len = m->m_len; 1976 } 1977 error = ipsec_get_policy(in6p, req, len, mp); 1978 if (error == 0) 1979 error = soopt_mcopyout(sopt, m); /* XXX */ 1980 if (error == 0 && m) 1981 m_freem(m); 1982 break; 1983 } 1984 #endif /* IPSEC */ 1985 1986 default: 1987 error = ENOPROTOOPT; 1988 break; 1989 } 1990 break; 1991 } 1992 } 1993 return (error); 1994 } 1995 1996 int 1997 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1998 { 1999 int error = 0, optval, optlen; 2000 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2001 struct inpcb *in6p = sotoinpcb(so); 2002 int level, op, optname; 2003 2004 level = sopt->sopt_level; 2005 op = sopt->sopt_dir; 2006 optname = sopt->sopt_name; 2007 optlen = sopt->sopt_valsize; 2008 2009 if (level != IPPROTO_IPV6) { 2010 return (EINVAL); 2011 } 2012 2013 switch (optname) { 2014 case IPV6_CHECKSUM: 2015 /* 2016 * For ICMPv6 sockets, no modification allowed for checksum 2017 * offset, permit "no change" values to help existing apps. 2018 * 2019 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2020 * for an ICMPv6 socket will fail." 2021 * The current behavior does not meet RFC3542. 2022 */ 2023 switch (op) { 2024 case SOPT_SET: 2025 if (optlen != sizeof(int)) { 2026 error = EINVAL; 2027 break; 2028 } 2029 error = sooptcopyin(sopt, &optval, sizeof(optval), 2030 sizeof(optval)); 2031 if (error) 2032 break; 2033 if ((optval % 2) != 0) { 2034 /* the API assumes even offset values */ 2035 error = EINVAL; 2036 } else if (so->so_proto->pr_protocol == 2037 IPPROTO_ICMPV6) { 2038 if (optval != icmp6off) 2039 error = EINVAL; 2040 } else 2041 in6p->in6p_cksum = optval; 2042 break; 2043 2044 case SOPT_GET: 2045 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2046 optval = icmp6off; 2047 else 2048 optval = in6p->in6p_cksum; 2049 2050 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2051 break; 2052 2053 default: 2054 error = EINVAL; 2055 break; 2056 } 2057 break; 2058 2059 default: 2060 error = ENOPROTOOPT; 2061 break; 2062 } 2063 2064 return (error); 2065 } 2066 2067 /* 2068 * Set up IP6 options in pcb for insertion in output packets or 2069 * specifying behavior of outgoing packets. 2070 */ 2071 static int 2072 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2073 struct socket *so, struct sockopt *sopt) 2074 { 2075 struct ip6_pktopts *opt = *pktopt; 2076 int error = 0; 2077 struct thread *td = sopt->sopt_td; 2078 2079 /* turn off any old options. */ 2080 if (opt) { 2081 #ifdef DIAGNOSTIC 2082 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2083 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2084 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2085 printf("ip6_pcbopts: all specified options are cleared.\n"); 2086 #endif 2087 ip6_clearpktopts(opt, -1); 2088 } else 2089 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2090 *pktopt = NULL; 2091 2092 if (!m || m->m_len == 0) { 2093 /* 2094 * Only turning off any previous options, regardless of 2095 * whether the opt is just created or given. 2096 */ 2097 free(opt, M_IP6OPT); 2098 return (0); 2099 } 2100 2101 /* set options specified by user. */ 2102 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2103 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2104 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2105 free(opt, M_IP6OPT); 2106 return (error); 2107 } 2108 *pktopt = opt; 2109 return (0); 2110 } 2111 2112 /* 2113 * initialize ip6_pktopts. beware that there are non-zero default values in 2114 * the struct. 2115 */ 2116 void 2117 ip6_initpktopts(struct ip6_pktopts *opt) 2118 { 2119 2120 bzero(opt, sizeof(*opt)); 2121 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2122 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2123 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2124 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2125 } 2126 2127 static int 2128 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2129 struct ucred *cred, int uproto) 2130 { 2131 struct ip6_pktopts *opt; 2132 2133 if (*pktopt == NULL) { 2134 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2135 M_WAITOK); 2136 ip6_initpktopts(*pktopt); 2137 } 2138 opt = *pktopt; 2139 2140 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2141 } 2142 2143 static int 2144 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2145 { 2146 void *optdata = NULL; 2147 int optdatalen = 0; 2148 struct ip6_ext *ip6e; 2149 int error = 0; 2150 struct in6_pktinfo null_pktinfo; 2151 int deftclass = 0, on; 2152 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2153 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2154 2155 switch (optname) { 2156 case IPV6_PKTINFO: 2157 if (pktopt && pktopt->ip6po_pktinfo) 2158 optdata = (void *)pktopt->ip6po_pktinfo; 2159 else { 2160 /* XXX: we don't have to do this every time... */ 2161 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2162 optdata = (void *)&null_pktinfo; 2163 } 2164 optdatalen = sizeof(struct in6_pktinfo); 2165 break; 2166 case IPV6_TCLASS: 2167 if (pktopt && pktopt->ip6po_tclass >= 0) 2168 optdata = (void *)&pktopt->ip6po_tclass; 2169 else 2170 optdata = (void *)&deftclass; 2171 optdatalen = sizeof(int); 2172 break; 2173 case IPV6_HOPOPTS: 2174 if (pktopt && pktopt->ip6po_hbh) { 2175 optdata = (void *)pktopt->ip6po_hbh; 2176 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2177 optdatalen = (ip6e->ip6e_len + 1) << 3; 2178 } 2179 break; 2180 case IPV6_RTHDR: 2181 if (pktopt && pktopt->ip6po_rthdr) { 2182 optdata = (void *)pktopt->ip6po_rthdr; 2183 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2184 optdatalen = (ip6e->ip6e_len + 1) << 3; 2185 } 2186 break; 2187 case IPV6_RTHDRDSTOPTS: 2188 if (pktopt && pktopt->ip6po_dest1) { 2189 optdata = (void *)pktopt->ip6po_dest1; 2190 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2191 optdatalen = (ip6e->ip6e_len + 1) << 3; 2192 } 2193 break; 2194 case IPV6_DSTOPTS: 2195 if (pktopt && pktopt->ip6po_dest2) { 2196 optdata = (void *)pktopt->ip6po_dest2; 2197 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2198 optdatalen = (ip6e->ip6e_len + 1) << 3; 2199 } 2200 break; 2201 case IPV6_NEXTHOP: 2202 if (pktopt && pktopt->ip6po_nexthop) { 2203 optdata = (void *)pktopt->ip6po_nexthop; 2204 optdatalen = pktopt->ip6po_nexthop->sa_len; 2205 } 2206 break; 2207 case IPV6_USE_MIN_MTU: 2208 if (pktopt) 2209 optdata = (void *)&pktopt->ip6po_minmtu; 2210 else 2211 optdata = (void *)&defminmtu; 2212 optdatalen = sizeof(int); 2213 break; 2214 case IPV6_DONTFRAG: 2215 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2216 on = 1; 2217 else 2218 on = 0; 2219 optdata = (void *)&on; 2220 optdatalen = sizeof(on); 2221 break; 2222 case IPV6_PREFER_TEMPADDR: 2223 if (pktopt) 2224 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2225 else 2226 optdata = (void *)&defpreftemp; 2227 optdatalen = sizeof(int); 2228 break; 2229 default: /* should not happen */ 2230 #ifdef DIAGNOSTIC 2231 panic("ip6_getpcbopt: unexpected option\n"); 2232 #endif 2233 return (ENOPROTOOPT); 2234 } 2235 2236 error = sooptcopyout(sopt, optdata, optdatalen); 2237 2238 return (error); 2239 } 2240 2241 void 2242 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2243 { 2244 if (pktopt == NULL) 2245 return; 2246 2247 if (optname == -1 || optname == IPV6_PKTINFO) { 2248 if (pktopt->ip6po_pktinfo) 2249 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2250 pktopt->ip6po_pktinfo = NULL; 2251 } 2252 if (optname == -1 || optname == IPV6_HOPLIMIT) 2253 pktopt->ip6po_hlim = -1; 2254 if (optname == -1 || optname == IPV6_TCLASS) 2255 pktopt->ip6po_tclass = -1; 2256 if (optname == -1 || optname == IPV6_NEXTHOP) { 2257 if (pktopt->ip6po_nextroute.ro_rt) { 2258 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2259 pktopt->ip6po_nextroute.ro_rt = NULL; 2260 } 2261 if (pktopt->ip6po_nexthop) 2262 free(pktopt->ip6po_nexthop, M_IP6OPT); 2263 pktopt->ip6po_nexthop = NULL; 2264 } 2265 if (optname == -1 || optname == IPV6_HOPOPTS) { 2266 if (pktopt->ip6po_hbh) 2267 free(pktopt->ip6po_hbh, M_IP6OPT); 2268 pktopt->ip6po_hbh = NULL; 2269 } 2270 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2271 if (pktopt->ip6po_dest1) 2272 free(pktopt->ip6po_dest1, M_IP6OPT); 2273 pktopt->ip6po_dest1 = NULL; 2274 } 2275 if (optname == -1 || optname == IPV6_RTHDR) { 2276 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2277 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2278 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2279 if (pktopt->ip6po_route.ro_rt) { 2280 RTFREE(pktopt->ip6po_route.ro_rt); 2281 pktopt->ip6po_route.ro_rt = NULL; 2282 } 2283 } 2284 if (optname == -1 || optname == IPV6_DSTOPTS) { 2285 if (pktopt->ip6po_dest2) 2286 free(pktopt->ip6po_dest2, M_IP6OPT); 2287 pktopt->ip6po_dest2 = NULL; 2288 } 2289 } 2290 2291 #define PKTOPT_EXTHDRCPY(type) \ 2292 do {\ 2293 if (src->type) {\ 2294 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2295 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2296 if (dst->type == NULL && canwait == M_NOWAIT)\ 2297 goto bad;\ 2298 bcopy(src->type, dst->type, hlen);\ 2299 }\ 2300 } while (/*CONSTCOND*/ 0) 2301 2302 static int 2303 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2304 { 2305 if (dst == NULL || src == NULL) { 2306 printf("ip6_clearpktopts: invalid argument\n"); 2307 return (EINVAL); 2308 } 2309 2310 dst->ip6po_hlim = src->ip6po_hlim; 2311 dst->ip6po_tclass = src->ip6po_tclass; 2312 dst->ip6po_flags = src->ip6po_flags; 2313 dst->ip6po_minmtu = src->ip6po_minmtu; 2314 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2315 if (src->ip6po_pktinfo) { 2316 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2317 M_IP6OPT, canwait); 2318 if (dst->ip6po_pktinfo == NULL) 2319 goto bad; 2320 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2321 } 2322 if (src->ip6po_nexthop) { 2323 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2324 M_IP6OPT, canwait); 2325 if (dst->ip6po_nexthop == NULL) 2326 goto bad; 2327 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2328 src->ip6po_nexthop->sa_len); 2329 } 2330 PKTOPT_EXTHDRCPY(ip6po_hbh); 2331 PKTOPT_EXTHDRCPY(ip6po_dest1); 2332 PKTOPT_EXTHDRCPY(ip6po_dest2); 2333 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2334 return (0); 2335 2336 bad: 2337 ip6_clearpktopts(dst, -1); 2338 return (ENOBUFS); 2339 } 2340 #undef PKTOPT_EXTHDRCPY 2341 2342 struct ip6_pktopts * 2343 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2344 { 2345 int error; 2346 struct ip6_pktopts *dst; 2347 2348 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2349 if (dst == NULL) 2350 return (NULL); 2351 ip6_initpktopts(dst); 2352 2353 if ((error = copypktopts(dst, src, canwait)) != 0) { 2354 free(dst, M_IP6OPT); 2355 return (NULL); 2356 } 2357 2358 return (dst); 2359 } 2360 2361 void 2362 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2363 { 2364 if (pktopt == NULL) 2365 return; 2366 2367 ip6_clearpktopts(pktopt, -1); 2368 2369 free(pktopt, M_IP6OPT); 2370 } 2371 2372 /* 2373 * Set IPv6 outgoing packet options based on advanced API. 2374 */ 2375 int 2376 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2377 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2378 { 2379 struct cmsghdr *cm = 0; 2380 2381 if (control == NULL || opt == NULL) 2382 return (EINVAL); 2383 2384 ip6_initpktopts(opt); 2385 if (stickyopt) { 2386 int error; 2387 2388 /* 2389 * If stickyopt is provided, make a local copy of the options 2390 * for this particular packet, then override them by ancillary 2391 * objects. 2392 * XXX: copypktopts() does not copy the cached route to a next 2393 * hop (if any). This is not very good in terms of efficiency, 2394 * but we can allow this since this option should be rarely 2395 * used. 2396 */ 2397 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2398 return (error); 2399 } 2400 2401 /* 2402 * XXX: Currently, we assume all the optional information is stored 2403 * in a single mbuf. 2404 */ 2405 if (control->m_next) 2406 return (EINVAL); 2407 2408 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2409 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2410 int error; 2411 2412 if (control->m_len < CMSG_LEN(0)) 2413 return (EINVAL); 2414 2415 cm = mtod(control, struct cmsghdr *); 2416 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2417 return (EINVAL); 2418 if (cm->cmsg_level != IPPROTO_IPV6) 2419 continue; 2420 2421 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2422 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2423 if (error) 2424 return (error); 2425 } 2426 2427 return (0); 2428 } 2429 2430 /* 2431 * Set a particular packet option, as a sticky option or an ancillary data 2432 * item. "len" can be 0 only when it's a sticky option. 2433 * We have 4 cases of combination of "sticky" and "cmsg": 2434 * "sticky=0, cmsg=0": impossible 2435 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2436 * "sticky=1, cmsg=0": RFC3542 socket option 2437 * "sticky=1, cmsg=1": RFC2292 socket option 2438 */ 2439 static int 2440 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2441 struct ucred *cred, int sticky, int cmsg, int uproto) 2442 { 2443 int minmtupolicy, preftemp; 2444 int error; 2445 2446 if (!sticky && !cmsg) { 2447 #ifdef DIAGNOSTIC 2448 printf("ip6_setpktopt: impossible case\n"); 2449 #endif 2450 return (EINVAL); 2451 } 2452 2453 /* 2454 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2455 * not be specified in the context of RFC3542. Conversely, 2456 * RFC3542 types should not be specified in the context of RFC2292. 2457 */ 2458 if (!cmsg) { 2459 switch (optname) { 2460 case IPV6_2292PKTINFO: 2461 case IPV6_2292HOPLIMIT: 2462 case IPV6_2292NEXTHOP: 2463 case IPV6_2292HOPOPTS: 2464 case IPV6_2292DSTOPTS: 2465 case IPV6_2292RTHDR: 2466 case IPV6_2292PKTOPTIONS: 2467 return (ENOPROTOOPT); 2468 } 2469 } 2470 if (sticky && cmsg) { 2471 switch (optname) { 2472 case IPV6_PKTINFO: 2473 case IPV6_HOPLIMIT: 2474 case IPV6_NEXTHOP: 2475 case IPV6_HOPOPTS: 2476 case IPV6_DSTOPTS: 2477 case IPV6_RTHDRDSTOPTS: 2478 case IPV6_RTHDR: 2479 case IPV6_USE_MIN_MTU: 2480 case IPV6_DONTFRAG: 2481 case IPV6_TCLASS: 2482 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2483 return (ENOPROTOOPT); 2484 } 2485 } 2486 2487 switch (optname) { 2488 case IPV6_2292PKTINFO: 2489 case IPV6_PKTINFO: 2490 { 2491 struct ifnet *ifp = NULL; 2492 struct in6_pktinfo *pktinfo; 2493 2494 if (len != sizeof(struct in6_pktinfo)) 2495 return (EINVAL); 2496 2497 pktinfo = (struct in6_pktinfo *)buf; 2498 2499 /* 2500 * An application can clear any sticky IPV6_PKTINFO option by 2501 * doing a "regular" setsockopt with ipi6_addr being 2502 * in6addr_any and ipi6_ifindex being zero. 2503 * [RFC 3542, Section 6] 2504 */ 2505 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2506 pktinfo->ipi6_ifindex == 0 && 2507 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2508 ip6_clearpktopts(opt, optname); 2509 break; 2510 } 2511 2512 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2513 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2514 return (EINVAL); 2515 } 2516 2517 /* validate the interface index if specified. */ 2518 if (pktinfo->ipi6_ifindex > V_if_index || 2519 pktinfo->ipi6_ifindex < 0) { 2520 return (ENXIO); 2521 } 2522 if (pktinfo->ipi6_ifindex) { 2523 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2524 if (ifp == NULL) 2525 return (ENXIO); 2526 } 2527 2528 /* 2529 * We store the address anyway, and let in6_selectsrc() 2530 * validate the specified address. This is because ipi6_addr 2531 * may not have enough information about its scope zone, and 2532 * we may need additional information (such as outgoing 2533 * interface or the scope zone of a destination address) to 2534 * disambiguate the scope. 2535 * XXX: the delay of the validation may confuse the 2536 * application when it is used as a sticky option. 2537 */ 2538 if (opt->ip6po_pktinfo == NULL) { 2539 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2540 M_IP6OPT, M_NOWAIT); 2541 if (opt->ip6po_pktinfo == NULL) 2542 return (ENOBUFS); 2543 } 2544 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2545 break; 2546 } 2547 2548 case IPV6_2292HOPLIMIT: 2549 case IPV6_HOPLIMIT: 2550 { 2551 int *hlimp; 2552 2553 /* 2554 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2555 * to simplify the ordering among hoplimit options. 2556 */ 2557 if (optname == IPV6_HOPLIMIT && sticky) 2558 return (ENOPROTOOPT); 2559 2560 if (len != sizeof(int)) 2561 return (EINVAL); 2562 hlimp = (int *)buf; 2563 if (*hlimp < -1 || *hlimp > 255) 2564 return (EINVAL); 2565 2566 opt->ip6po_hlim = *hlimp; 2567 break; 2568 } 2569 2570 case IPV6_TCLASS: 2571 { 2572 int tclass; 2573 2574 if (len != sizeof(int)) 2575 return (EINVAL); 2576 tclass = *(int *)buf; 2577 if (tclass < -1 || tclass > 255) 2578 return (EINVAL); 2579 2580 opt->ip6po_tclass = tclass; 2581 break; 2582 } 2583 2584 case IPV6_2292NEXTHOP: 2585 case IPV6_NEXTHOP: 2586 if (cred != NULL) { 2587 error = priv_check_cred(cred, 2588 PRIV_NETINET_SETHDROPTS, 0); 2589 if (error) 2590 return (error); 2591 } 2592 2593 if (len == 0) { /* just remove the option */ 2594 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2595 break; 2596 } 2597 2598 /* check if cmsg_len is large enough for sa_len */ 2599 if (len < sizeof(struct sockaddr) || len < *buf) 2600 return (EINVAL); 2601 2602 switch (((struct sockaddr *)buf)->sa_family) { 2603 case AF_INET6: 2604 { 2605 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2606 int error; 2607 2608 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2609 return (EINVAL); 2610 2611 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2612 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2613 return (EINVAL); 2614 } 2615 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2616 != 0) { 2617 return (error); 2618 } 2619 break; 2620 } 2621 case AF_LINK: /* should eventually be supported */ 2622 default: 2623 return (EAFNOSUPPORT); 2624 } 2625 2626 /* turn off the previous option, then set the new option. */ 2627 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2628 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2629 if (opt->ip6po_nexthop == NULL) 2630 return (ENOBUFS); 2631 bcopy(buf, opt->ip6po_nexthop, *buf); 2632 break; 2633 2634 case IPV6_2292HOPOPTS: 2635 case IPV6_HOPOPTS: 2636 { 2637 struct ip6_hbh *hbh; 2638 int hbhlen; 2639 2640 /* 2641 * XXX: We don't allow a non-privileged user to set ANY HbH 2642 * options, since per-option restriction has too much 2643 * overhead. 2644 */ 2645 if (cred != NULL) { 2646 error = priv_check_cred(cred, 2647 PRIV_NETINET_SETHDROPTS, 0); 2648 if (error) 2649 return (error); 2650 } 2651 2652 if (len == 0) { 2653 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2654 break; /* just remove the option */ 2655 } 2656 2657 /* message length validation */ 2658 if (len < sizeof(struct ip6_hbh)) 2659 return (EINVAL); 2660 hbh = (struct ip6_hbh *)buf; 2661 hbhlen = (hbh->ip6h_len + 1) << 3; 2662 if (len != hbhlen) 2663 return (EINVAL); 2664 2665 /* turn off the previous option, then set the new option. */ 2666 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2667 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2668 if (opt->ip6po_hbh == NULL) 2669 return (ENOBUFS); 2670 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2671 2672 break; 2673 } 2674 2675 case IPV6_2292DSTOPTS: 2676 case IPV6_DSTOPTS: 2677 case IPV6_RTHDRDSTOPTS: 2678 { 2679 struct ip6_dest *dest, **newdest = NULL; 2680 int destlen; 2681 2682 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2683 error = priv_check_cred(cred, 2684 PRIV_NETINET_SETHDROPTS, 0); 2685 if (error) 2686 return (error); 2687 } 2688 2689 if (len == 0) { 2690 ip6_clearpktopts(opt, optname); 2691 break; /* just remove the option */ 2692 } 2693 2694 /* message length validation */ 2695 if (len < sizeof(struct ip6_dest)) 2696 return (EINVAL); 2697 dest = (struct ip6_dest *)buf; 2698 destlen = (dest->ip6d_len + 1) << 3; 2699 if (len != destlen) 2700 return (EINVAL); 2701 2702 /* 2703 * Determine the position that the destination options header 2704 * should be inserted; before or after the routing header. 2705 */ 2706 switch (optname) { 2707 case IPV6_2292DSTOPTS: 2708 /* 2709 * The old advacned API is ambiguous on this point. 2710 * Our approach is to determine the position based 2711 * according to the existence of a routing header. 2712 * Note, however, that this depends on the order of the 2713 * extension headers in the ancillary data; the 1st 2714 * part of the destination options header must appear 2715 * before the routing header in the ancillary data, 2716 * too. 2717 * RFC3542 solved the ambiguity by introducing 2718 * separate ancillary data or option types. 2719 */ 2720 if (opt->ip6po_rthdr == NULL) 2721 newdest = &opt->ip6po_dest1; 2722 else 2723 newdest = &opt->ip6po_dest2; 2724 break; 2725 case IPV6_RTHDRDSTOPTS: 2726 newdest = &opt->ip6po_dest1; 2727 break; 2728 case IPV6_DSTOPTS: 2729 newdest = &opt->ip6po_dest2; 2730 break; 2731 } 2732 2733 /* turn off the previous option, then set the new option. */ 2734 ip6_clearpktopts(opt, optname); 2735 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2736 if (*newdest == NULL) 2737 return (ENOBUFS); 2738 bcopy(dest, *newdest, destlen); 2739 2740 break; 2741 } 2742 2743 case IPV6_2292RTHDR: 2744 case IPV6_RTHDR: 2745 { 2746 struct ip6_rthdr *rth; 2747 int rthlen; 2748 2749 if (len == 0) { 2750 ip6_clearpktopts(opt, IPV6_RTHDR); 2751 break; /* just remove the option */ 2752 } 2753 2754 /* message length validation */ 2755 if (len < sizeof(struct ip6_rthdr)) 2756 return (EINVAL); 2757 rth = (struct ip6_rthdr *)buf; 2758 rthlen = (rth->ip6r_len + 1) << 3; 2759 if (len != rthlen) 2760 return (EINVAL); 2761 2762 switch (rth->ip6r_type) { 2763 case IPV6_RTHDR_TYPE_0: 2764 if (rth->ip6r_len == 0) /* must contain one addr */ 2765 return (EINVAL); 2766 if (rth->ip6r_len % 2) /* length must be even */ 2767 return (EINVAL); 2768 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2769 return (EINVAL); 2770 break; 2771 default: 2772 return (EINVAL); /* not supported */ 2773 } 2774 2775 /* turn off the previous option */ 2776 ip6_clearpktopts(opt, IPV6_RTHDR); 2777 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2778 if (opt->ip6po_rthdr == NULL) 2779 return (ENOBUFS); 2780 bcopy(rth, opt->ip6po_rthdr, rthlen); 2781 2782 break; 2783 } 2784 2785 case IPV6_USE_MIN_MTU: 2786 if (len != sizeof(int)) 2787 return (EINVAL); 2788 minmtupolicy = *(int *)buf; 2789 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2790 minmtupolicy != IP6PO_MINMTU_DISABLE && 2791 minmtupolicy != IP6PO_MINMTU_ALL) { 2792 return (EINVAL); 2793 } 2794 opt->ip6po_minmtu = minmtupolicy; 2795 break; 2796 2797 case IPV6_DONTFRAG: 2798 if (len != sizeof(int)) 2799 return (EINVAL); 2800 2801 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2802 /* 2803 * we ignore this option for TCP sockets. 2804 * (RFC3542 leaves this case unspecified.) 2805 */ 2806 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2807 } else 2808 opt->ip6po_flags |= IP6PO_DONTFRAG; 2809 break; 2810 2811 case IPV6_PREFER_TEMPADDR: 2812 if (len != sizeof(int)) 2813 return (EINVAL); 2814 preftemp = *(int *)buf; 2815 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2816 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2817 preftemp != IP6PO_TEMPADDR_PREFER) { 2818 return (EINVAL); 2819 } 2820 opt->ip6po_prefer_tempaddr = preftemp; 2821 break; 2822 2823 default: 2824 return (ENOPROTOOPT); 2825 } /* end of switch */ 2826 2827 return (0); 2828 } 2829 2830 /* 2831 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2832 * packet to the input queue of a specified interface. Note that this 2833 * calls the output routine of the loopback "driver", but with an interface 2834 * pointer that might NOT be &loif -- easier than replicating that code here. 2835 */ 2836 void 2837 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2838 { 2839 struct mbuf *copym; 2840 struct ip6_hdr *ip6; 2841 2842 copym = m_copy(m, 0, M_COPYALL); 2843 if (copym == NULL) 2844 return; 2845 2846 /* 2847 * Make sure to deep-copy IPv6 header portion in case the data 2848 * is in an mbuf cluster, so that we can safely override the IPv6 2849 * header portion later. 2850 */ 2851 if ((copym->m_flags & M_EXT) != 0 || 2852 copym->m_len < sizeof(struct ip6_hdr)) { 2853 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2854 if (copym == NULL) 2855 return; 2856 } 2857 ip6 = mtod(copym, struct ip6_hdr *); 2858 /* 2859 * clear embedded scope identifiers if necessary. 2860 * in6_clearscope will touch the addresses only when necessary. 2861 */ 2862 in6_clearscope(&ip6->ip6_src); 2863 in6_clearscope(&ip6->ip6_dst); 2864 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 2865 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 2866 CSUM_PSEUDO_HDR; 2867 copym->m_pkthdr.csum_data = 0xffff; 2868 } 2869 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2870 } 2871 2872 /* 2873 * Chop IPv6 header off from the payload. 2874 */ 2875 static int 2876 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2877 { 2878 struct mbuf *mh; 2879 struct ip6_hdr *ip6; 2880 2881 ip6 = mtod(m, struct ip6_hdr *); 2882 if (m->m_len > sizeof(*ip6)) { 2883 mh = m_gethdr(M_NOWAIT, MT_DATA); 2884 if (mh == NULL) { 2885 m_freem(m); 2886 return ENOBUFS; 2887 } 2888 m_move_pkthdr(mh, m); 2889 MH_ALIGN(mh, sizeof(*ip6)); 2890 m->m_len -= sizeof(*ip6); 2891 m->m_data += sizeof(*ip6); 2892 mh->m_next = m; 2893 m = mh; 2894 m->m_len = sizeof(*ip6); 2895 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2896 } 2897 exthdrs->ip6e_ip6 = m; 2898 return 0; 2899 } 2900 2901 /* 2902 * Compute IPv6 extension header length. 2903 */ 2904 int 2905 ip6_optlen(struct inpcb *in6p) 2906 { 2907 int len; 2908 2909 if (!in6p->in6p_outputopts) 2910 return 0; 2911 2912 len = 0; 2913 #define elen(x) \ 2914 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2915 2916 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2917 if (in6p->in6p_outputopts->ip6po_rthdr) 2918 /* dest1 is valid with rthdr only */ 2919 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2920 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2921 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2922 return len; 2923 #undef elen 2924 }
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